CN110323955A - A kind of off-network splits phase device and inverter system - Google Patents

A kind of off-network splits phase device and inverter system Download PDF

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Publication number
CN110323955A
CN110323955A CN201910516735.2A CN201910516735A CN110323955A CN 110323955 A CN110323955 A CN 110323955A CN 201910516735 A CN201910516735 A CN 201910516735A CN 110323955 A CN110323955 A CN 110323955A
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CN
China
Prior art keywords
capacitor
switch circuit
voltage
switch
inductance
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Granted
Application number
CN201910516735.2A
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Chinese (zh)
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CN110323955B (en
Inventor
封宁波
裔杰
汪航
王庆雨
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Huawei Digital Power Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to CN201910516735.2A priority Critical patent/CN110323955B/en
Publication of CN110323955A publication Critical patent/CN110323955A/en
Priority to PCT/CN2020/081152 priority patent/WO2020248651A1/en
Priority to EP20822724.9A priority patent/EP3905509A4/en
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Publication of CN110323955B publication Critical patent/CN110323955B/en
Priority to US17/471,701 priority patent/US11632056B2/en
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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
    • H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
    • H02M5/06—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using impedances
    • H02M5/08—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using impedances using capacitors only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
    • H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
    • H02M5/22—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M5/275—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M5/293—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M5/2932—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage, current or power
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/18—Networks for phase shifting
    • H03H7/21—Networks for phase shifting providing two or more phase shifted output signals, e.g. n-phase output
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P5/00—Coupling devices of the waveguide type
    • H01P5/12—Coupling devices having more than two ports
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/388—Islanding, i.e. disconnection of local power supply from the network
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0083—Converters characterised by their input or output configuration
    • H02M1/009—Converters characterised by their input or output configuration having two or more independently controlled outputs
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Inverter Devices (AREA)

Abstract

The application provides a kind of off-network and splits phase device and inverter system, and in one embodiment, it includes: first input port and the second input port that the off-network, which splits phase device, is connect respectively with the first phase port of power supply and the second phase port；First output port and second output terminal mouth provide second voltage, second output terminal mouth and third output port for the first load and provide tertiary voltage for the second load；First capacitor and the second capacitor, first capacitor are connected between the first output port and second output terminal mouth, and the second capacitance connection is between second output terminal mouth and third output port；First switch circuit and second switch circuit, first switch circuit and second switch circuit are connected between first input port and the second input port, first switch circuit and second switch circuit mutually one-way conduction in opposite direction；First node is set between first switch circuit and second switch circuit；Inductance, inductance connection is between first node and second output terminal mouth.

Description

A kind of off-network splits phase device and inverter system
Technical field
The present invention relates to inverter technology fields more particularly to a kind of off-network to split phase device and inverter system.
Background technique
Inverter is the power-supply system that DC power supply is reverse into AC power source, is widely used in the generations of electricity by new energy such as photovoltaic Industry.As the core equipment of power generation, the DC inversion after inverter optimizes photovoltaic module is exchange, then selection conveying electricity Net (grid-connected) or load supplying (off-network).Inverter system a kind of in the prior art as shown in Figure 1, is generally configured with 3 Power port: direct-flow input end mouth, battery port and ac output end mouth, corresponding three main operation modes, being respectively as follows: will be straight The solar DC electricity inversion of stream input is alternating current, is exported from ac output end mouth grid-connected；When mains failure, by battery-end The DC inverter of mouth is alternating current, exports powering load from ac output end mouth；By the solar DC electricity of direct current input Charge the battery (energy storage) after transformation.
Worldwide household power supply system there are two kinds of voltage class, 220V network system and 110V network system, And the gird-connected inverter of present industry, it is all to be designed according to the system of 220V.
When grid-connected inverters operation, for the system of 220V, AC port is connected on its firewire and zero curve；And for Japan/U.S. etc. uses the area of 110V system, and the ac output end mouth of inverter is connected to two firewires of 110V system, Voltage difference is 110V*1.732=190.5V, close to 220V.The unitized of gird-connected inverter in global range has been achieved.
When city's electrical anomaly, inverter can disconnect the connection with power grid, work under off-network mode.If inverter connects There is battery, the alternating voltage of 220V can be exported, directly powers to the load of 220V system user.But the system of 110V is come It says, this voltage class can not be used to the load of 110V system.This just needs to be depressured 220V or split phase, makes its output Voltage drops to 110V or so, for Domestic single-phase load supplying.
At present the off-network in traditional inverter system split mutually mostly using power frequency isolation transformer or auto-transformer into Row splits phase, however power frequency isolation transformer or auto-transformer all have that volume is big, the big problem of quality, and in grid-connected application Energy can be consumed, low efficiency is caused.In addition to this, power frequency isolation transformer or auto-transformer are being cut into when off-network is applied Afterwards, there are transient process for transformer, will appear very big surge current in this process, are easy to blow insurance or glue dead relay Device, there are hidden danger.
Summary of the invention
Embodiments herein provides a kind of off-network and splits phase device and inverter system, is split by off-network provided by the present application Phase device realizes the power reguirements to different loads system；Meanwhile the transformer of inverter system being replaced with provided by the present application After off-network splits phase device, the presence due to transformer can solve, lead to the volume problems of too of inverter system and surge occur Electric current blows insurance or glues the security hidden trouble of dead relay.
In order to achieve the above object, embodiments herein adopts the following technical scheme that
In a first aspect, the application, which provides a kind of off-network, splits phase device, comprising: first input port, the second input port, first Output port, second output terminal mouth, third output port, first capacitor, the second capacitor, first switch circuit, second switch electricity Road and inductance；The first input port and second input port, connect to power supply respectively；The power supply passes through described the One phase port and second phase port provide first voltage；First output port, the second output terminal mouth and described Third output port, first output port and the second output terminal mouth provide second voltage for the first load, and described the Two output ports and the third output port load for second provides tertiary voltage；The second voltage and the tertiary voltage The respectively less than described first voltage；The first capacitor and second capacitor, the first capacitor are connected to first output Between port and the second output terminal mouth, second capacitance connection is in the second output terminal mouth and the third output end Between mouthful；The first switch circuit and the second switch circuit, the first switch circuit and the second switch circuit It is connected between the first input port and second input port, the first switch circuit and second switch electricity Road mutually one-way conduction in opposite direction；Wherein it is provided between the first switch circuit and the second switch circuit First node；The inductance, the inductance connection is between the first node and the second output terminal mouth；Wherein, described First switch circuit and the second switch circuit allow the electricity in the first capacitor to be transferred to described by the inductance On two capacitors, or the electricity on second capacitor is allowed to be transferred in the first capacitor by the inductance.The application is implemented After example is by splitting two input port of phase device access external power supply circuit for off-network, pass through control first switch circuit and second switch The on or off of circuit, to control the voltage of first capacitor C1 and the second both ends capacitor C2, to realize and be exported to first Voltage between voltage and second output terminal mouth N between port L1 and second output terminal mouth N and third output port L2 carries out Regulation makes the off-network split phase device satisfaction to the power reguirements of different loads system.
In another possible realization, further includes: driving control system, the driving control system is according to described first Capacitor both end voltage and the second capacitor both end voltage control the first switch circuit and the second switch circuit Carry out one-way conduction.The application controls first switch circuit by driving control system and the unidirectional of second switch circuit is led It is logical, realize the regulation that phase device is split to off-network.
In another possible realization, when the absolute value of the voltage value of the first capacitor both end voltage is greater than described the The absolute value of the voltage value of two capacitor both end voltages, and the voltage between first output port and the third output port When value is positive value, the second switch circuit forms access along third direction；When first switch circuit shape in a first direction At access, the first capacitor discharges to the inductance；When the first switch circuit forms open circuit in a first direction, institute State inductance by the second switch circuit along third direction to second capacitor charging；Or when the first capacitor both ends electricity The absolute value of the voltage value of pressure is greater than the absolute value of the voltage value of the second capacitor both end voltage, and first output port When voltage value between the third output port is negative value, the second switch circuit forms access along fourth direction；When The first switch circuit forms access in second direction, and the first capacitor discharges to the inductance；When described first Switching circuit forms open circuit in second direction, and the inductance is by the second switch circuit along fourth direction to second electricity Capacity charge；Or when the absolute value of the voltage value of the first capacitor both end voltage is less than the voltage of the second capacitor both end voltage The absolute value of value, and the voltage value between first output port and the third output port be positive value when, described first Switching circuit forms access along first direction；When the second switch circuit the third direction formed access, described second Capacitor discharges to the inductance；When the second switch circuit forms open circuit, the inductance passes through the first switch electricity Curb first direction charges to the first capacitor；Or when the absolute value of the voltage value of the first capacitor both end voltage is less than institute The absolute value of the voltage value of the second capacitor both end voltage is stated, and between first output port and the third output port When voltage value is negative value, the first switch circuit forms access in a second direction；When the second switch circuit is described Four directions form access, and second capacitor discharges to the inductance；It is described when the second switch circuit forms open circuit First switch circuit described in inductance in a second direction charges to the first capacitor；Wherein, the first direction and described second Direction is opposite direction, and the third direction and the fourth direction are opposite directions, and electric current on the first switch circuit Electric current is flowed on the direction and the second switch circuit of the inductance along described in the third direction the along the first direction The direction that three directions flow to the inductance is identical.
In another possible realization, the first switch circuit includes first switch and the second switch, and described second Switching circuit includes third switch and the 4th switch, the first switch, for allowing the first switch circuit described first Direction forms access or open circuit；The second switch, for allowing the first switch circuit to form access in the second direction Or open circuit；The third switch, for allowing the second switch circuit to form access or open circuit in the third direction；Described Four switches, for allowing the second switch circuit to form access or open circuit in the fourth direction.
In another possible realization, the first switch, the second switch, third switch and the described 4th Switch is formed by metal-oxide-semiconductor.
In another possible realization, driving control system includes: collector, for acquiring the first capacitor both ends The electric current of voltage, the second capacitor both end voltage and the inductance；Voltage regulator, for receiving the first capacitor both ends The difference of the voltage value of voltage and the voltage value of the second capacitor both end voltage, obtains the first electric current；Current regulator is used for The electric current for generating electric current and the inductance is received, the 4th voltage is obtained；The driving control system is according to first electricity Hold biggish voltage value and the 4th voltage in both end voltage and the second capacitor both end voltage, calculates for controlling State the duty ratio of first switch, the second switch, third switch and the 4th switch.
Second aspect, the application provide a kind of off-network split phase method, wherein first input port and the second input port, It connects to power supply respectively；The power supply provides first voltage by first phase port and second phase port；First is defeated Exit port, second output terminal mouth and third output port；Wherein first output port and the second output terminal mouth are the One load provides second voltage, the second output terminal mouth and the third output port and provides tertiary voltage for the second load； The second voltage and the tertiary voltage are respectively less than the first voltage；It include: according to first capacitor both end voltage and second The voltage difference of capacitor both end voltage controls the circuit conducting in first switch circuit and second switch circuit, first capacitor With a capacitor in the second capacitor to inductive discharge；The first capacitor is connected to first output port and described second Between output port, second capacitance connection is between the second output terminal mouth and the third output port；Described One switching circuit and the second switch circuit are connected between the first input port and second input port；Wherein First node is provided between the first switch circuit and the second switch circuit；The inductance connection is described first Between node and the second output terminal mouth；Control another electricity in the first switch circuit and the second switch circuit Road conducting, the inductance is to another capacitor charging in the first capacitor and second capacitor.
The third aspect, the application provide a kind of inverter system, comprising: inverter, for DC signal to be converted into Ac signal；Off-network splits phase device, and it is that any off-network in the cards that first aspect is related to splits phase that the off-network, which splits phase device, Device, the power supply have the inverter to provide, and the first phase port and the second phase port of the power supply are the two of the inverter A output phase port.The application is split after phase device divides out different voltages by off-network, can satisfy in the negative of different voltages system The requirement of power supply is carried, and structure is simple, reduces volume and weight compared to transformer, minimizes product, modularization, to save Save product cost and transportation cost.It does not work when grid-connected secondly, the off-network in the application splits phase device, when grid-connected compared to transformer Grid side consumption energy is hung over, efficiency is improved.
Detailed description of the invention
The attached drawing used required in embodiment or description of the prior art is briefly described below.
Fig. 1 is a kind of structural schematic diagram of inverter system in the prior art；
Fig. 2 is the structural schematic diagram that a kind of off-network provided by the embodiments of the present application splits phase device；
Fig. 3 is provided by the embodiments of the present application when facies tract carrying capacity of the facies tract carrying capacity of first capacitor C1 less than the second capacitor C2 When off-network split the schematic diagram of phase device output voltage equilibrium process；
Fig. 4 is the facies tract carrying capacity provided by the embodiments of the present application for being greater than the second capacitor C2 when the facies tract carrying capacity of first capacitor C1 When off-network split the schematic diagram of phase device output voltage equilibrium process；
Fig. 5 is the facies tract carrying capacity provided by the embodiments of the present application for being greater than the second capacitor C2 when the facies tract carrying capacity of first capacitor C1 When driving control system the schematic diagram of phase device control process is split to off-network；
Fig. 6 is provided by the embodiments of the present application when facies tract carrying capacity of the facies tract carrying capacity of first capacitor C1 less than the second capacitor C2 When driving control system the schematic diagram of phase device control process is split to off-network；
Fig. 7 is a kind of schematic diagram of inverter system provided by the embodiments of the present application；
Fig. 8 is a kind of structural schematic diagram for the inverter system that phase device is split using off-network provided by the embodiments of the present application.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present application, technical solutions in the embodiments of the present application is described.
Fig. 2 is the structural schematic diagram that a kind of off-network provided by the embodiments of the present application splits phase device.As shown in Fig. 2, the off-network is split Phase device includes two input ports and three output ports.Two input ports include input port K1 and input port K2, defeated Inbound port K1 and input port K2 is connect with the first phase port of power supply and the second phase port respectively, and power supply passes through input port K1 First voltage is provided with input port K2；Three output ports include output port L1, output port N and output port L2, defeated Exit port L1 and output port N provides second voltage, output port N and output port L2 for the first load and provides for the second load Tertiary voltage.Wherein, second voltage and tertiary voltage are respectively less than first voltage.
In a preferred embodiment, input port K1 and output port L1 share a port, input port K2 and Output port L2 shares a port.
It in a preferred embodiment, is single phase alternating current power supply with the external power supply of two input ports.Certainly, with two The external power supply of a input port is not only limited to alternating current, can be direct current.
It includes first capacitor C1 and the second capacitor C2 that the off-network, which splits phase device, wherein first capacitor C1 is connected to output port Between L1 and output port N, the second capacitor C2 is connected between output port N and output port L2.First capacitor C1 two at this time The voltage V at endC1Voltage between as output port L1 and output port N, the voltage V at the second both ends capacitor C2C2As export Voltage between port N and output port L2.Voltage VC1And VC2It can be used for driving load.
According to application scenarios, first capacitor C2 and the second capacitor C2 can be thin-film capacitor, electrolytic capacitor etc., the application Embodiment is not limited.
It includes first switch circuit and second switch circuit that the off-network, which splits phase device, first switch circuit and second switch circuit It is connected between input port K1 and input port K2, a node is set between first switch circuit and second switch circuit P, connect an inductance L between node P and output port N.
In the embodiment of the present application, inductance L plays the intermediation of energy transfer.In one embodiment, with first capacitor The voltage V at the both ends C1C1Greater than the voltage V at the second both ends capacitor C2C2, and the voltage transfer at the both ends first capacitor C1 is a part of For voltage to the process at the second both ends capacitor C2, first switch circuit is connected, as a result, in first capacitor C1, first switch Circuit and inductance L constitute unidirectional loop circuit, and are discharged by first capacitor C1 inductance L.Specifically, by first capacitor C1, The loop circuit that one switching circuit and inductance L are constituted is in the conductive state, and in the conducting of first switch circuit, first capacitor C1 is put Electricity, circuit generate electric current, can generate inductance electromotive force on the coil of inductance L.Then, after the completion of first capacitor C1 electric discharge, break First switch circuit is opened, second switch circuit is connected, constitutes unidirectional ring in the second capacitor C2, second switch circuit and inductance L Shape circuit, and charged by inductance L to the second capacitor C2.Specifically, it is made of the second capacitor C2, second switch circuit and inductance L Loop circuit it is in the conductive state, at this time due to there is inductance electromotive force on inductance L, can charge to the second capacitor C2.From And realize the voltage V for reducing the both ends first capacitor C1C1Promote the voltage V at the second both ends capacitor C2C2, realize first capacitor C1 A part of voltage of the voltage transfer at both ends is to the second both ends capacitor C2.
It should be noted that transfer voltage number according to capacitor release charge electricity it is related, so by control open The time of powered-down road conducting realizes the control to transfer voltage to control the electricity that capacitor releases charge.
In addition, inductance L helps to prevent the voltage jump of first capacitor C1 and the second both ends capacitor C2, in order to avoid in modulation the In one switching circuit and second switch circuitry processes, there is very big loop current, damages switching circuit.
In the embodiment of the present application, the effect of first switch circuit is the loop circuit for making to participate in constituting by first switch circuit Synchronization can only one-way conduction.
In one embodiment, as shown in Fig. 2, the annular electro constituted in first capacitor C1, first switch circuit and inductance L Lu Zhong, when the conducting of first switch circuit and first capacitor C1 electric discharge, inductance L charges, but due to first switch circuit Synchronization can only one-way conduction, to avoid generating resonant tank between inductance L and first capacitor C1.
In one embodiment, as shown in Fig. 2, the annular electro constituted in first capacitor C1, first switch circuit and inductance L Lu Zhong, when first switch circuit conducting and first capacitor C1 charge when, inductance L during discharge, due to first switch circuit Synchronization can only one-way conduction, thus avoid first capacitor C1 first switch circuit conducting when electric discharge, inductance L and first Resonant tank is generated between capacitor C1.
The effect of second switch circuit be the loop circuit that makes to be made of second switch circuit synchronization can only be unidirectional Conducting.Specific implementation process is identical with first switch circuit theory, and details are not described herein again.
In one embodiment, first switch circuit includes MOS (Metal Oxide Semiconductor, metal-oxygen Compound-semiconductor) pipe Q1a and metal-oxide-semiconductor Q1b, wherein the drain electrode of metal-oxide-semiconductor Q1a is connect with input port K1, the source electrode of metal-oxide-semiconductor Q1a It is connect with the source electrode of metal-oxide-semiconductor Q1b, the drain electrode of metal-oxide-semiconductor Q1b is connect with node P；Second switch circuit includes metal-oxide-semiconductor Q2a and MOS Pipe Q2b, wherein the drain electrode of metal-oxide-semiconductor Q2a is connect with node P, and the source electrode of metal-oxide-semiconductor Q2a is connect with the source electrode of metal-oxide-semiconductor Q2b, metal-oxide-semiconductor The drain electrode of Q2b is connect with output port L2.
In the first circuit, for metal-oxide-semiconductor Q1a, when grid provides high level, electric current two-way can pass through Metal-oxide-semiconductor Q1a；When grid provides low level, electric current can only circulate from by metal-oxide-semiconductor Q1a body diode, and direction is metal-oxide-semiconductor The source electrode of Q1a is directed toward drain electrode.For metal-oxide-semiconductor Q1b, when grid provides high level, electric current two-way can pass through metal-oxide-semiconductor Q1b；When grid provides low level, electric current can only circulate from metal-oxide-semiconductor Q1b body diode, and direction is that the source electrode of metal-oxide-semiconductor Q1b refers to To drain electrode.
In the first switch circuit course of work, metal-oxide-semiconductor Q1a and metal-oxide-semiconductor Q1b switch state be it is complementary, that is, work as metal-oxide-semiconductor Metal-oxide-semiconductor Q1b is disconnected when Q1a is connected, or metal-oxide-semiconductor Q1b is connected when metal-oxide-semiconductor Q1a is disconnected.So for the first circuit, when When metal-oxide-semiconductor Q1a grid is high level and metal-oxide-semiconductor Q1b grid is low level, electric current can only flow to MOS from the drain electrode of metal-oxide-semiconductor Q1a The drain electrode of pipe Q1b；When metal-oxide-semiconductor Q1a grid is low level and metal-oxide-semiconductor Q1b grid is high level, electric current can only be from metal-oxide-semiconductor Q1b Drain electrode flow to the drain electrode of metal-oxide-semiconductor Q1a.
In second circuit, for metal-oxide-semiconductor Q2a, when grid provides high level, electric current two-way can pass through MOS Pipe Q2a；When grid provides low level, electric current can only circulate from metal-oxide-semiconductor Q2a body diode, and direction is the source electrode of metal-oxide-semiconductor Q2a It is directed toward drain electrode.For metal-oxide-semiconductor Q2b, when grid provides high level, electric current two-way can pass through metal-oxide-semiconductor Q2b；Work as grid When providing low level, electric current can only circulate from metal-oxide-semiconductor Q2b body diode, and the source electrode that direction is metal-oxide-semiconductor Q2b is directed toward drain electrode.
In the second switch circuit course of work, metal-oxide-semiconductor Q2a and metal-oxide-semiconductor Q2b switch state are also complementary.So for For second circuit, when metal-oxide-semiconductor Q2a grid is high level and metal-oxide-semiconductor Q2b grid is low level, electric current can only be from metal-oxide-semiconductor The drain electrode of Q2a flows to the drain electrode of metal-oxide-semiconductor Q2b；When metal-oxide-semiconductor Q2a grid is low level and metal-oxide-semiconductor Q2b grid is high level, electricity Stream can only flow to the drain electrode of metal-oxide-semiconductor Q2a from the drain electrode of metal-oxide-semiconductor Q2b.
It should be noted that first switch circuit and second switch circuit are realized using metal-oxide-semiconductor in the embodiment of the present application , but the application is not limited only to metal-oxide-semiconductor, can also be other device for power switching such as IGBT, the embodiment of the present application is not to it It is limited.
It is opened it should be noted that being not limited only to two in first switch circuit and second switch circuit in the embodiment of the present application It closes, or three switches, four switches etc..
The application by off-network split two input port of phase device access external power supply circuit after, by control first switch circuit and The on or off of second switch circuit, to control the voltage of first capacitor C1 and the second both ends capacitor C2, thus realize and it is right Voltage between voltage between output port L1 and output port N and output port N and output port L2 is regulated and controled, this is made Off-network splits phase device satisfaction to the power reguirements of different loads system.
Following embodiment will be never modulated to together with the voltage at the both ends first capacitor C1 and the voltage at the second both ends capacitor C2 For identical process, tell about the off-network in the embodiment of the present application and split phase device working principle.Those skilled in the art are easily Expect that off-network provided herein splits phase device and can also carry out the modulation of form, is not limited thereto.
It should be noted that when off-network splits phase device access single-phase alternating current in the embodiment of the present application, according to alternating current Sinusoidal variations rule, the voltage of half period are positive value, and in addition the voltage of half period is negative value.It is subsequent for convenience to retouch State, provided herein, in one cycle, by alternating current be positive value when half period provide positive half cycle；Alternating current is negative Half period when value is defined as negative half period.
Fig. 3 is provided by the embodiments of the present application when facies tract carrying capacity of the facies tract carrying capacity of first capacitor C1 less than the second capacitor C2 When off-network split the schematic diagram of phase device output voltage equilibrium process.Wherein, the facies tract carrying capacity of first capacitor C1 refers to first capacitor Electricity on two pole plates of C1.When facies tract carrying capacity of the facies tract carrying capacity of first capacitor C1 less than the second capacitor C2, then first is electric The voltage effective value for holding the both ends C1 is greater than the voltage effective value at the second both ends capacitor C2, i.e., | Vc1|>|Vc2|。
Fig. 3 includes Fig. 3 (a), Fig. 3 (b), Fig. 3 (c) and four parts Fig. 3 (d).Wherein, Fig. 3 (a) and Fig. 3 (b) are illustrated The alternating current that off-network splits the two input ports access of phase device splits phase device output voltage equilibrium process in positive half cycle off-network；Fig. 3 (c) and The alternating current that Fig. 3 (d) illustrates the two input ports access that off-network splits phase device splits phase device output voltage balance in negative half period off-network Process.
As shown in Fig. 3 (a), allows the metal-oxide-semiconductor Q2a in second switch circuit to be placed in off state and metal-oxide-semiconductor Q2b is placed in conducting State, so that electric current can only be connected along clockwise in the loop being made of second switch circuit；At the same time, then to first Metal-oxide-semiconductor Q1a and metal-oxide-semiconductor Q1b in switching circuit carry out pulse width modulation (Pulse Width Modulation, PWM) control System.
First switch circuit carry out pulse width modulation during, firstly, by metal-oxide-semiconductor Q1a be placed on state and Metal-oxide-semiconductor Q1b is placed in off state, and first switch circuit, first capacitor C1 and inductance L constitute loop at this time.First capacitor as a result, C1 discharges, and electric current increases on inductance L, and current reflux at this time is C1 → Q1a → Q1b → L, charges to inductance L.
Then, metal-oxide-semiconductor Q1a is placed in off state and metal-oxide-semiconductor Q1b is placed on state, at this time first switch circuit, In the loop that one capacitor C1 and inductance L is constituted, electric current can only be connected along clockwise；And in second switch circuit, due to electric current It can be connected in the loop being made of second switch circuit, the second capacitor C2 and inductance L along clockwise, inductance L afterflow at this time continues Flowing back to road is L → C2 → Q2b → Q2a, charges to the second capacitor C2, as shown in Fig. 3 (b), makes the voltage at the both ends first capacitor C1 Vc1With the voltage V at the second both ends capacitor C2c2It is equal.
As shown in Fig. 3 (c), allows the metal-oxide-semiconductor Q2a in second switch circuit to be placed on state and metal-oxide-semiconductor Q2b is placed in shutdown State, so that electric current can only be connected along inverse clock in the loop being made of second switch circuit；At the same time, then to first Metal-oxide-semiconductor Q1a and metal-oxide-semiconductor Q1b in switching circuit carry out PWM control.
First switch circuit carry out pulse width modulation during, firstly, by metal-oxide-semiconductor Q1a be placed in off state and Metal-oxide-semiconductor Q1b is placed on state, and first switch circuit, first capacitor C1 and inductance L constitute loop at this time.First capacitor as a result, C1 discharges, and electric current increases on inductance L, and current reflux at this time is C1 → L → Q1b → Q1a, charges to inductance L.
Then, metal-oxide-semiconductor Q1a is placed on state and metal-oxide-semiconductor Q1b is placed in off state, at this time first switch circuit, In the loop that one capacitor C1 and inductance L is constituted, electric current can only be connected along inverse clock；And in second switch circuit, due to electric current It can be connected in the loop being made of second switch circuit, the second capacitor C2 and inductance L along inverse clock, inductance L afterflow at this time continues Flowing back to road is L → Q2a → Q2b → C2, charges to the second capacitor C2, as shown in Fig. 3 (d), makes the voltage at the both ends first capacitor C1 Vc1With the voltage V at the second both ends capacitor C2c2It is equal.
Fig. 4 is the facies tract carrying capacity provided by the embodiments of the present application for being greater than the second capacitor C2 when the facies tract carrying capacity of first capacitor C1 When off-network split the schematic diagram of phase device output voltage equilibrium process.When the facies tract carrying capacity of first capacitor C1 is greater than the second capacitor C2's When facies tract carrying capacity, then the voltage effective value at the both ends first capacitor C1 less than the second both ends capacitor C2 voltage effective value, i.e., | Vc1|< |Vc2|。
Fig. 4 includes Fig. 4 (a), Fig. 4 (b), Fig. 4 (c) and four parts Fig. 4 (d).Wherein, Fig. 4 (a) and Fig. 4 (b) are illustrated The alternating current that off-network splits the two input ports access of phase device splits phase device output voltage equilibrium process in positive half cycle off-network；Fig. 4 (c) and The alternating current that Fig. 4 (d) illustrates the two input ports access that off-network splits phase device splits phase device output voltage balance in negative half period off-network Process.
As shown in Fig. 4 (a), allows the metal-oxide-semiconductor Q1a in first switch circuit to be placed in off state and metal-oxide-semiconductor Q1b is placed in conducting State, so that electric current can only be connected along clockwise in the loop being made of first switch circuit；At the same time, then to second Metal-oxide-semiconductor Q2a and metal-oxide-semiconductor Q2b in switching circuit carry out PWM control.
Second switch circuit carry out pulse width modulation during, firstly, by metal-oxide-semiconductor Q2a be placed on state and Metal-oxide-semiconductor Q2b is placed in off state, and second switch circuit, the second capacitor C2 and inductance L constitute loop at this time.Second capacitor as a result, C2 discharges, and electric current increases on inductance L, and current reflux at this time is C2 → L → Q2a → Q2b, charges to inductance L.
Then, metal-oxide-semiconductor Q2a is placed in off state and metal-oxide-semiconductor Q2b is placed on state, at this time second switch circuit, In the loop that two capacitor C2 and inductance L are constituted, electric current can only be connected along clockwise；And in first switch circuit, due to electric current It can be connected in the loop being made of first switch circuit, first capacitor C1 and inductance L along clockwise, inductance L afterflow at this time continues Flowing back to road is L → Q1b → Q1a → C1, charges to first capacitor C1, as shown in Fig. 4 (b), makes the voltage at the both ends first capacitor C1 Vc1With the voltage V at the second both ends capacitor C2c2It is equal.
As shown in Fig. 4 (c), allows the metal-oxide-semiconductor Q1a in first switch circuit to be placed on state and metal-oxide-semiconductor Q1b is placed in shutdown State, so that electric current can only be connected along inverse clock in the loop being made of first switch circuit；At the same time, then to second Metal-oxide-semiconductor Q2a and metal-oxide-semiconductor Q2b in switching circuit carry out PWM control.
Second switch circuit carry out pulse width modulation during, firstly, by metal-oxide-semiconductor Q2a be placed in off state and Metal-oxide-semiconductor Q2b is placed on state, and second switch circuit, the second capacitor C2 and inductance L constitute loop at this time.Second capacitor as a result, C2 discharges, and electric current increases on inductance L, and current reflux at this time is C2 → Q2b → Q2a → L, charges to inductance L.
Then, metal-oxide-semiconductor Q2a is placed on state and metal-oxide-semiconductor Q2b is placed in off state, at this time second switch circuit, In the loop that two capacitor C2 and inductance L are constituted, electric current can only be connected along inverse clock；And in first switch circuit, due to electric current It can be connected in the loop being made of first switch circuit, first capacitor C1 and inductance L along inverse clock, inductance L afterflow at this time continues Flowing back to road is L → C1 → Q1a → Q1b, charges to first capacitor C1, as shown in Fig. 4 (d), makes the voltage at the both ends first capacitor C1 Vc1With the voltage V at the second both ends capacitor C2c2It is equal.
In one embodiment, the grid of metal-oxide-semiconductor Q1a, metal-oxide-semiconductor Q1b, metal-oxide-semiconductor Q2a and metal-oxide-semiconductor Q2b are connected to driving Control system, driving control system is according to the voltage V at the both ends first capacitor C1c1With the voltage V at the second both ends capacitor C2c2To MOS Pipe Q1a, metal-oxide-semiconductor Q1b, metal-oxide-semiconductor Q2a and metal-oxide-semiconductor Q2b carry out PWM control, are on or off state.Off-network splits phase The specific control strategy of device is as follows:
Collector real-time sampling off-network in driving control system splits the instantaneous voltage at the both ends first capacitor C1 of phase device Vc1With the instantaneous voltage V at the second both ends capacitor C2c2, then judge Vc1And Vc2The size of absolute value.Wherein, output port L1 Voltage V between output port L2oEqual to the instantaneous voltage V at the both ends first capacitor C1c1With the electricity at the second both ends capacitor C2 Press instantaneous value Vc2The sum of.Meanwhile collector also acquires the transient current on inductance L.
Fig. 5 is the facies tract carrying capacity provided by the embodiments of the present application for being greater than the second capacitor C2 when the facies tract carrying capacity of first capacitor C1 When driving control system the schematic diagram of phase device control process is split to off-network.As shown in figure 5, working as | Vc1 | > | Vc2 | when, voltage is adjusted The instantaneous voltage V at device (Automatic Voltage Regulation, AVR) the reception both ends first capacitor C1c1With the second electricity Hold the instantaneous voltage V at the both ends C2c2Between difference, obtain inductive current iL*；Current regulator (Automatic Current Regulation, ACR) receive AVR generate inductive current iL* and collector acquisition inductance L on transient current between Difference obtains inductive drop V*.
Then, half of the driving control system by inductive drop V* than upper output total voltage Vo absolute value, obtains control and becomes D1 is measured, the control variables D 1 is then decomposed into (1+D1)/2 and (1-D1)/2 as the duty ratio of metal-oxide-semiconductor Q1a and Q1b. Meanwhile directly taking Vc1Value than its upper absolute value, obtain control variables D 2, which be decomposed into (1+D2)/2 He The duty ratio of (1-D2)/2 respectively as metal-oxide-semiconductor Q2b and Q2a.This control process will make C1 discharge by adjusting duty ratio, C2 Charging, the final voltage V for realizing the both ends first capacitor C1c1With the voltage V at the second both ends capacitor C2c2It is equal.
Fig. 6 is provided by the embodiments of the present application when facies tract carrying capacity of the facies tract carrying capacity of first capacitor C1 less than the second capacitor C2 When driving control system the schematic diagram of phase device control process is split to off-network.As shown in fig. 6, working as | Vc1 | < | Vc2 | when, AVR is received The instantaneous voltage V at the both ends first capacitor C1c1With the instantaneous voltage V at the second both ends capacitor C2c2Between difference, obtain electricity Inducing current iL*；ACR receives the difference between the transient current on the inductive current iL* that AVR is generated and the inductance L of collector acquisition Value, obtains inductive drop V*.
Then, half of the driving control system by inductive drop V* than upper output total voltage Vo absolute value, obtains control and becomes D3 is measured, the control variables D 3 is then decomposed into (1+D3)/2 and (1-D3)/2 as the duty ratio of metal-oxide-semiconductor Q2a and Q2b. Meanwhile directly taking Vc1Value than its upper absolute value, obtain control variables D 4, which be decomposed into (1+D4)/2 He The duty ratio of (1-D4)/2 respectively as metal-oxide-semiconductor Q1b and Q1a.This control process will make C2 discharge by adjusting duty ratio, C1 Charging, the final voltage V for realizing the both ends first capacitor C1c1With the voltage V at the second both ends capacitor C2c2It is equal.
A kind of off-network provided by the embodiments of the present application splits phase device, by dividing to the voltage of access, allows output port Different voltage is exported, splits phase device to the power reguirements of different loads system to meet off-network.
Fig. 7 is a kind of schematic diagram of inverter system provided by the embodiments of the present application.As shown in fig. 7, the embodiment of the present application The inverter system of offer includes that inverter and off-network split phase device.
Inverter is used to DC signal being converted into ac signal.In one embodiment, when inverter and direct current Power supply connection is then input to power grid or negative by inverter by the converting direct-current voltage into alternating-current voltage of DC supply input In load.
Wherein, ac signal can also be converted into DC signal by inverter.In another embodiment, work as inversion When device is connect with electric energy storage device, the alternating voltage inputted from power grid is converted by DC voltage by inverter, is then inputted Storage is carried out into electric energy storage device.
Off-network is split phase device and is connect with inverter, divides for receiving ac signal, and to ac signal, then Ac signal after partial pressure is input to and is split in the load or/and power grid that phase device is connected with off-network.
Wherein, it is that the off-network that above-mentioned the embodiment of the present application proposes splits phase that the off-network applied in inverter system, which splits phase device, Details are not described herein for device, structure and working principle.
Fig. 8 is a kind of structural schematic diagram for the inverter system that phase device is split using off-network provided by the embodiments of the present application.Such as Shown in Fig. 8, the alternating voltage of inverter output provided by the embodiments of the present application is 220V, and off-network splits the output end that phase device divides out The voltage between voltage and output port N and output port L2 between mouth L1 and output port N is 110V.
Inverter system provided by the embodiments of the present application includes that inverter, off-network split phase device, first switch K1, second switch K2 and third switch K3.
Inverter splits phase device with DC power supply, electric energy storage device, power grid, load and off-network respectively and connect；It is defeated that off-network splits phase device Inbound port is connect with inverter and power grid, and output port and power grid and load connect；First switch K1 setting is in inverter and electricity Between net and load, for controlling the connection between inverter and power grid and load；Second switch K2 setting inverter with from Between check crack phase device, connection between phase device is split for controlling inverter and off-network；Third switch K3 setting is in inverter and bears Between load, for controlling the connection between inverter and load.
When grid-connected inverters are run, control switch K1, K3 is opened, and K2 shutdown, off-network splits input port and the inversion of phase device Device output port disconnects.Inverter draws energy from DC power supply, charges to network grid-connected power and to electric energy storage device, power grid pair Load supplying.The port L1, N, L2 of power grid is respectively connected to the output port that off-network splits phase device, controls off-network at this time and splits phase device All switches are in an off state, then the off-network splits phase device and do not work, and does not generate power loss.
When inverter off-grid operation, control switch K1, K3 shutdown, K2 open, off-network split phase device input and inverter it is defeated Exit port connection, output port connect load, which can be the load (load connects between L1, L2) of 220V system, can also Think the single-phase load of 110V system (load connects between L1, N or L2, N).When the output that off-network splits phase device connects 220V system Load when, which splits phase device and is similarly in off position, does not generate power loss；When the output that off-network splits phase device connects When the load of 110V system, it may appear that between L1, N between the load and L2, N of (C1 phase) laod unbalance of (C2 phase) feelings Condition causes C1 phase output voltage and C2 phase output voltage uneven, is needed at this time with derided capacitors C1 phase voltage Vc1 and partial pressure electricity The voltage difference for holding C2 phase voltage Vc2 is control object, using switch dynamic regulation Vc1 and Vc2, guarantees that the two output voltage is flat Weighing apparatus.
The embodiment of the present application provides a kind of inverter system that phase device is split using off-network, splits phase device by off-network and divides out not It after voltage, can satisfy in the requirement of the load supplying of different voltages system, and structure is simple, reduce body compared to transformer Long-pending and weight, minimizes product, modularization, to save product cost and transportation cost.Secondly, the off-network in the application is split Phase device does not work when grid-connected, and grid side consumption energy is hung over when grid-connected compared to transformer, improves efficiency.
In the description of this specification, particular features, structures, materials, or characteristics can be real in any one or more It applies and is combined in a suitable manner in example or example.
Finally, it is stated that: above embodiments are only to illustrate the technical solution of the application, and limit it；Although reference The application is described in detail in previous embodiment, those skilled in the art should understand that: it still can be right Technical solution documented by foregoing embodiments is modified or equivalent replacement of some of the technical features；And this A little modifications or substitutions, the spirit and scope of each embodiment technical solution of the application that it does not separate the essence of the corresponding technical solution.

Claims (8)

1. a kind of off-network splits phase device characterized by comprising first input port, the second input port, the first output port, Second output terminal mouth, third output port, first capacitor, the second capacitor, first switch circuit, second switch circuit and inductance；
The first input port and second input port, connect to power supply respectively；The power supply provides first voltage；
First output port, the second output terminal mouth and the third output port, first output port and institute It states second output terminal mouth and provides second voltage for the first load, the second output terminal mouth and the third output port are second Load provides tertiary voltage；The second voltage and the tertiary voltage are respectively less than the first voltage；
The first capacitor and second capacitor, the first capacitor are connected to first output port and described second defeated Between exit port, second capacitance connection is between the second output terminal mouth and the third output port；
The first switch circuit and the second switch circuit, the first switch circuit and second switch circuit series connection Between the first input port and second input port, the first switch circuit and the second switch circuit phase Mutual one-way conduction in opposite direction；Wherein first is provided between the first switch circuit and the second switch circuit Node；
The inductance, the inductance connection is between the first node and the second output terminal mouth；
Wherein, the first switch circuit and the second switch circuit allow the electricity in the first capacitor to pass through the inductance It is transferred on second capacitor, or the electricity on second capacitor is allowed to be transferred to the first capacitor by the inductance On.
2. off-network according to claim 1 splits phase device, which is characterized in that further include: driving control system, the driving control System processed controlled according to the first capacitor both end voltage and the second capacitor both end voltage the first switch circuit and The carry out one-way conduction of the second switch circuit.
3. off-network according to claim 1 splits phase device, which is characterized in that
When the absolute value of the voltage value of the first capacitor both end voltage is greater than the voltage value of the second capacitor both end voltage Absolute value, and the voltage value between first output port and the third output port be positive value when, the second switch Circuit forms access along third direction；When the first switch circuit forms access in a first direction, the first capacitor is to institute Inductance is stated to discharge；When the first switch circuit forms open circuit in a first direction, the inductance passes through the second switch Circuit is along third direction to second capacitor charging；Or
When the absolute value of the voltage value of the first capacitor both end voltage is greater than the voltage value of the second capacitor both end voltage Absolute value, and the voltage value between first output port and the third output port be negative value when, the second switch Circuit forms access along fourth direction；When the first switch circuit forms access in second direction, the first capacitor is to institute Inductance is stated to discharge；When the first switch circuit forms open circuit in second direction, the inductance passes through the second switch Circuit is along fourth direction to second capacitor charging；Or
When the absolute value of the voltage value of the first capacitor both end voltage is less than the voltage value of the second capacitor both end voltage Absolute value, and the voltage value between first output port and the third output port be positive value when, the first switch Circuit forms access along first direction；When the second switch circuit forms access, second capacitor in the third direction It discharges the inductance；When the second switch circuit forms open circuit, the inductance passes through first switch circuit edge First direction charges to the first capacitor；Or
When the absolute value of the voltage value of the first capacitor both end voltage is less than the voltage value of the second capacitor both end voltage Absolute value, and the voltage value between first output port and the third output port be negative value when, the first switch Circuit forms access in a second direction；When the second switch circuit forms access, second capacitor in the fourth direction It discharges the inductance；When the second switch circuit forms open circuit, first switch circuit is along second described in the inductance It charges to the first capacitor in direction；
Wherein, the first direction and the second direction are opposite directions, and the third direction and the fourth direction are phases Opposite direction, and on the first switch circuit electric current along the first direction flow to the inductance direction and the second switch Electric current is identical along the direction that third direction described in the third direction flows to the inductance on circuit.
4. off-network according to claim 3 splits phase device, which is characterized in that the first switch circuit include first switch and Second switch, the second switch circuit include that third switch and the 4th switch,
The first switch, for allowing the first switch circuit to form access or open circuit in the first direction；Described second Switch, for allowing the first switch circuit to form access or open circuit in the second direction；
The third switch, for allowing the second switch circuit to form access or open circuit in the third direction；Described 4th Switch, for allowing the second switch circuit to form access or open circuit in the fourth direction.
5. off-network according to claim 3 splits phase device, which is characterized in that the first switch, the second switch, described Third switch and the 4th switch are formed by metal-oxide-semiconductor.
6. splitting phase device according to off-network described in claim 2-5, which is characterized in that driving control system includes:
Collector, for acquiring the electric current of the first capacitor both end voltage, the second capacitor both end voltage and the inductance；
Voltage regulator, for receiving the voltage value of the first capacitor both end voltage and the electricity of the second capacitor both end voltage The difference of pressure value obtains the first electric current；
Current regulator obtains the 4th voltage for receiving the electric current for generating electric current and the inductance；
The driving control system is according to biggish electricity in the first capacitor both end voltage and the second capacitor both end voltage Pressure value and the 4th voltage, calculate for control the first switch, the second switch, the third switch and it is described The duty ratio of 4th switch.
7. a kind of off-network split phase method, wherein first input port and the second input port connect to power supply respectively；The electricity Source provides first voltage；First output port, second output terminal mouth and third output port；Wherein first output port and The second output terminal mouth provides second voltage for the first load, and the second output terminal mouth and the third output port are the Two loads provide tertiary voltage；The second voltage and the tertiary voltage are respectively less than the first voltage；It is characterized in that, packet It includes:
According to the voltage difference of first capacitor both end voltage and the second capacitor both end voltage, first switch circuit and second switch are controlled A circuit in circuit is connected, and a capacitor in first capacitor and the second capacitor is to inductive discharge；The first capacitor connects It connects between first output port and the second output terminal mouth, second capacitance connection is in the second output terminal mouth Between the third output port；The first switch circuit and the second switch circuit are connected on the first input end Between mouth and second input port；Is wherein provided between the first switch circuit and the second switch circuit One node；The inductance connection is between the first node and the second output terminal mouth；
Another circuit conducting in the first switch circuit and the second switch circuit is controlled, the inductance is to described the Another capacitor charging in one capacitor and second capacitor.
8. a kind of inverter system characterized by comprising
Inverter, for DC signal to be converted into ac signal；
Off-network splits phase device, and it is that such as claim 1 to the described in any item off-networks of claim 6 split phase device that the off-network, which splits phase device, The power supply has the inverter to provide, and the first phase port and the second phase port of the power supply are that two of the inverter are defeated Phase port out.
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